Trinacromerum
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| Trinacromerum Fossil range: Late Cretaceous |
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Trinacromerum bentonianum from the Late Cretaceous of Kansas
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Trinacromerum at Royal Ontario Museum.
Trinacromerum is an extinct genus of sauropterygian reptile belonging to the plesiosaur suborder. It lived during the Late Cretaceous period in what is now Kansas. It was 3 meters (10 feet) long. Its teeth show it fed on small fish.

